/Engine/Source/Runtime/Renderer/Public/InstanceCulling/InstanceCullingContext.h
Call SetDynamicPrimitiveInstanceOffsets (unless that is achieved somehow else).
void BeginAsyncSetup ( [SyncPrerequisitesFuncType](API\Runtime\Renderer\InstanceCulling\FInstanceCullingContext\SyncPrerequisite-) && InSyncPrerequisitesFunc )